Process for producing isoprene.



after fractional distillation is pure enoughvapors of 1.3-dihydro UNITEDSTATES PATENT- orrron.

LUCAS rn'rnon KYRIAKIDES, or BOSTON, imssncnus'nrrs, ASSIGNOR 'ro noonRUBBER COMPANY A CORPORATION OF MASSACHUSETTS.

PROCESS FOR PRODUCING ISOPRENE.

No Drawing.

Specification of Letters Patent.

To all whom it may concern:

Be it known that I, LucAs P. KYmAKmEs,

citizen of the United States, residing at Boston, Massachusetts, haveinvented certain new and useful Improvements in Processes for Producinglowing is a specification.

The new process consists in passing the -2-methylbutane, CH (OH) .CH(CI-I .GH OH) .CH,, ,over dehydrating catalytics such as aluminumsilicate (kaolin) at temperatures ranging from 300500 0., and varyingpressures.

-The reaction proceeds according to the following equation:

OH, OH .CH(CH3).CH OH ori CH2 o (GHQiOH OH,+2H,O.

In order to illustrate the process .more fully, the following example isgiven: The methylbutandiol, of the above formula, is distilled slowlyover aluminum silicate kept at about 400 0., the pressure being,preferably, reduced by means of a vacuum pump. The reactionproducts arecondensed by means of refrigerating agents. The isoprene to be used assuch. The yield of isoprene is over 70% of the theory.

I claim:

1. The process of producing isoprene which consists in bringing thevapors of a methylbutandiol into contact with a heated dehydratingcatalytic.

2. The process of producing isoprene which consists in passing thevapors of a Isoprene, of which the fol catalytic.

3. The process of which consists in passing the vapors of amethylbutandiol over a heated dehydrating catalytic at a reducedpressure.

4. The process of producing isoprene ing the products.

The process of producing isoprene, which consists in passing the. vaporsof 1.3-

dihydroxy-Q-methylbutane, over heated dehydrating catalytics at atemperature not less than 300 C.

methylbutandiol over a heated dehydrating Patented Apr. 21, 1914.Application filed January 17, 1912. Serial No. 671,715. r

producing isoprene hydrating catalytic, and thereafter. condens-- 8. Theprocess of producing isoprene,

which consists in passing the vapors of 1.3- dihytlroxy-Q-methylbutaneover heated aluminum silicate at a temperature not less than 3000. G I vIn testimony whereof, I afiix my signature in presence 0t two witnesses.

LUCAS PETRON KYRIAKIDES.

Witnesses: J. R. Morr, M. A. HAGARTY.

